private void MoveUp()
{
var currentDisplayElement = CurrentDisplayElement;
var index = DisplayElements.IndexOf(currentDisplayElement);
DisplayElements.Move(index, index - 1);
}
private bool CanMoveUp()
{
var currentDisplayElement = CurrentDisplayElement;
return(currentDisplayElement != null && DisplayElements.IndexOf(currentDisplayElement) != 0);
}
private bool CanMoveDown()
{
var currentDisplayElement = CurrentDisplayElement;
return(currentDisplayElement != null && DisplayElements.IndexOf(currentDisplayElement) != DisplayElements.Count - 1);
}
